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6 Operation
6
Operation
GB
You can operate the cooling unit using the controller
on the front of the device (page 5, Fig. 1, no. 11).
Depending on the model, the unit is equipped with
a Basic or Comfort controller.
6.1 Control using the Basic controller
For Model Nos. SK xxxx.100/.110/.140 and
SK
xxxx.200/.210/.240.
3
Fig. 34: Basic controller
Key
1
Controller trim panel
2
Temperature setting
3
LED green ("line")
4
LED red ("alarm")
5
Reset button
22
1
4
2
5
6.1.1 Properties
– Three voltage variants are supported:
– 115 V
– 230 V
– 400/460 V, 3 phases
– Supports multiple voltages without rewiring
– Integral start-up delay and door limit switch func-
tion
– Protective function to prevent icing
– Monitoring of all motors (compressor, condenser
fan, evaporator fan)
– Phase monitoring for three-phase units
– Visualisation of the operating status via
LED display:
– Voltage on, device operational
– Door open (only if door limit switch installed)
– Warning of overtemperature
– High-pressure-operated switch has switched
– Switching hysteresis: 5 K
– Floating system message contact in case of over-
temperature
– Temperature setting
(setting range 20 – 55°C) via potentiometer
– Test function
The cooling unit operates automatically i.e. after
switching on the power supply, the evaporator fan
(see page 5, Fig. 2) will run continuously and perma-
nently circulate the internal enclosure air. The built-in
basic regulator ensures automatic normal shut-down
operation of the cooling unit by the value of the fixed
preset switching difference of 5 K.
Rittal cooling unit assembly instructions
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